共查询到19条相似文献,搜索用时 586 毫秒
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针对传统气体检测方法的不足,提出了基于嵌入式和卟啉阵列传感器的气体快速检测系统及其图像分析算法。该系统通过USB接口的摄像头采集待测气体与卟啉阵列传感器反应前后的RGB图像信息,再由图像处理算法得到图像中每个卟啉点的颜色变化信息,最后通过模式识别算法得到待测气体种类和浓度。重点研究了检测系统的结构及软件功能的设计,给出了针对卟啉阵列传感图像的图像处理算法及与标准数据库匹配的模式识别算法。通过对氨气等气体进行试验,结果表明该系统及其分析算法能够很好地识别出气体的种类和浓度。 相似文献
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电子鼻—智能气体传感器 总被引:6,自引:0,他引:6
论述了应用模式识别技术和气体传感器阵列所研制的模拟嗅觉系统。气体传感器阵列由8个金属氧化物气敏器件组成,它们对不同的气味和气体有不同的响应;传感器阵列输出的信号经过微机处理和识别。作者对实验过程进行了详细的讨论,实验结果表明该系统可成功地识别多种不同的气体。 相似文献
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《微型机与应用》2019,(1)
金属氧化物气敏传感器可以实时检测识别化学气体成分,对不同化学气体成分敏感的传感器组成气敏传感器阵列,可以有效识别多种气味,进一步识别散发气味的物体及物体的状态。相比传统的化学试剂分析方法,气敏传感器阵列具有实时性、高可用性、高性价比等优点。金属氧化物气敏传感器的性能会受到温度、湿度的影响导致传感器输出值波动,对气敏传感器阵列正确识别气味产生干扰。利用温度、湿度与传感器输出值之间的能带关系构建能带模型,通过模型拟合实时温湿度及其变化对传感器输出值产生的影响偏差序列,利用计算得到的偏差值序列校正传感器输出数据,达到弱化传感器与温湿度相关性的目的。该方法应用于传感器数据采集过程后的数据预处理阶段,独立于构建完整气味识别系统中的数据建模过程。实验结果显示该方法有效增强了基于气敏传感器阵列构建的气味识别系统的目标识别率。 相似文献
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A novel humid electronic nose combined with an electronic tongue for assessing deterioration of wine 总被引:2,自引:0,他引:2
Luis Gil-SánchezAuthor Vitae Juan SotoAuthor Vitae Ramón Martínez-MáñezAuthor Vitae Eduardo Garcia-BreijoAuthor Vitae Javier IbáñezAuthor Vitae Eduard LlobetAuthor Vitae 《Sensors and actuators. A, Physical》2011,171(2):152-158
We report herein the use of a combined system for the analysis of the spoilage of wine when in contact with air. The system consists of a potentiometric electronic tongue and a humid electronic nose. The potentiometric electronic tongue was built with thick-film serigraphic techniques using commercially available resistances and conductors for hybrid electronic circuits; i.e. Ag, Au, Cu, Ru, AgCl, and C. The humid electronic nose was designed in order to detect vapours that emanate from the wine and are apprehended by a moist environment. The humid nose was constructed using a piece of thin cloth sewn, damped with distilled water, forming five hollows of the right size to introduce the electrodes. In this particular case four electrodes were used for the humid electronic nose: a glass electrode, aluminium (Al), graphite and platinum (Pt) wires and an Ag-AgCl reference electrode. The humid electronic nose together with the potentiometric electronic tongue were used for the evaluation of the evolution in the course of time of wine samples. Additionally to the analysis performed by the tongue and nose, the spoilage of the wines was followed via a simple determination of the titratable (total) acidity. 相似文献
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鉴于目前安检设备无法检测一些具有挥发性的有毒有害或易燃、易爆液态危险品。利用电子鼻气味识别的功能,将X射线检测技术与电子鼻气味识别技术有机的结合起来,分析了箱体容积内运动气体的流动特性,并确定电子鼻的位置分布及数量,实验表明:该方法对挥发性的有毒有害或易燃、易爆液态危险品检测的概率达到85%,电子鼻技术的应用克服X射线检测仪识别物质不全面的缺点,实现了对危险品的全面检测,提高了安检仪的性能。 相似文献
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针对交通环境中毒害较大的CO、NO2和CH4三种气体,优选金属氧化物半导体气体传感器构成阵列,并对BP网络进行改进,采用有弹回的BP算法,构造了电子鼻系统。实验结果表明,系统能够以较高的精度检测出交通环境中三种有毒气体的浓度。 相似文献
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基于BP神经网络的猪肉新鲜度检测方法 总被引:1,自引:0,他引:1
猪肉在储藏、加工和运输过程中因为腐败会挥发出氨气、硫化氢等,据此选择8个金属氧化物半导体气敏传感器构成检测阵列,运用改进的BP神经网络算法建立猪肉新鲜度智能检测的数学模型,从而构建了猪肉新鲜度检测电子鼻系统。通过检测实验构建样本数据集,并对识别模型进行训练、测试,结果表明该模型对猪肉新鲜度的预测结果与用理化分析方法所得实际结果具有很好的吻合度,预测准确率大于90%。 相似文献
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《Sensors and actuators. B, Chemical》2006,113(1):347-353
Over the past years, electronic nose technology opened the possibility to exploit information on behavior aroma to assess fruit ripening stage. The objective in this study was to evaluate the capacity of electronic nose to monitoring the change in volatile production of mandarin during different picking-date, using a specific electronic nose device (PEN 2). Principal component analysis (PCA) and linear discriminant analysis (LDA) were used in order to investigate whether the electronic nose was able to distinguish among different picking-date (ripeness states). The loadings analysis was used to identify the sensors responsible for discrimination in the current pattern file. The results obtained prove that the electronic nose PEN 2 can discriminate successfully different picking-date on mandarin using LDA analysis. But, electronic nose was not able to detect a clear difference in volatile profile on mandarin using PCA analysis. During external validation using LDA was obtained to classified 92% of the total samples properly. Some sensors have the highest influence in the current pattern file for electronic nose PEN 2. A subset of few sensors can be chosen to explain all the variance. This result could be used in further studies to optimize the number of sensors. 相似文献